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Diffstat (limited to 'Documentation/device-mapper/dm-crypt.txt')
| -rw-r--r-- | Documentation/device-mapper/dm-crypt.txt | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/Documentation/device-mapper/dm-crypt.txt b/Documentation/device-mapper/dm-crypt.txt index 692171fe9da0..6f15fcea9566 100644 --- a/Documentation/device-mapper/dm-crypt.txt +++ b/Documentation/device-mapper/dm-crypt.txt @@ -21,13 +21,30 @@ Parameters: <cipher> <key> <iv_offset> <device path> \ /proc/crypto contains supported crypto modes <key> - Key used for encryption. It is encoded as a hexadecimal number. + Key used for encryption. It is encoded either as a hexadecimal number + or it can be passed as <key_string> prefixed with single colon + character (':') for keys residing in kernel keyring service. You can only use key sizes that are valid for the selected cipher in combination with the selected iv mode. Note that for some iv modes the key string can contain additional keys (for example IV seed) so the key contains more parts concatenated into a single string. +<key_string> + The kernel keyring key is identified by string in following format: + <key_size>:<key_type>:<key_description>. + +<key_size> + The encryption key size in bytes. The kernel key payload size must match + the value passed in <key_size>. + +<key_type> + Either 'logon' or 'user' kernel key type. + +<key_description> + The kernel keyring key description crypt target should look for + when loading key of <key_type>. + <keycount> Multi-key compatibility mode. You can define <keycount> keys and then sectors are encrypted according to their offsets (sector 0 uses key0; @@ -90,6 +107,12 @@ dmsetup create crypt1 --table "0 `blockdev --getsize $1` crypt aes-cbc-essiv:sha [[ #!/bin/sh +# Create a crypt device using dmsetup when encryption key is stored in keyring service +dmsetup create crypt2 --table "0 `blockdev --getsize $1` crypt aes-cbc-essiv:sha256 :32:logon:my_prefix:my_key 0 $1 0" +]] + +[[ +#!/bin/sh # Create a crypt device using cryptsetup and LUKS header with default cipher cryptsetup luksFormat $1 cryptsetup luksOpen $1 crypt1 |